I was told by someone that this supposedly is possible with spamming unpause commands while the pause countdown timer (the 5-4-3-2-1-pause) runs down.
However, I just ran a test no-statgame, bound M to 'unpause' and mashed it before my testing-partner called the pause (and while it was pausing) and it didn't work. I'm to lazy to write a script that does it more reliably (especially because I highly doubt this method works at all) so if this should be actually the way and it has to happen several times in a certain frame or something you might wanna test it with a script.

I doubt it as the timeframe where the unpause happens in all the cases here is somewhat random between 0 and 15 seconds.